After Connecticut's most expensive campaign ever, voters on Tuesday chose Democrat Chris Murphy as the state's newest U.S. senator, once again rejecting multimillionaire former wrestling executive Linda McMahon, the Republican nominee.

McMahon sunk more than $43 million of her vast fortune in her quest to win the open seat — on top of the $50 million she spent on her unsuccessful 2010 Senate bid — but all that money was unable overcome her persistently high negative poll ratings and the structural disadvantage faced by Republican candidates in deep blue Connecticut.

"Tonight we proved that what matters most in life is the measure of your ideas, the measure of your determination and the measure of your friends, not the measure of your wallet," Murphy told a jubilant crowd of supporters at the Hartford Hilton. "I am proud to be your next U.S. Senator."

Murphy, who was joined on stage by his family, said he had just ended a telephone call with McMahon and congratulated "her for a hard-fought race," as the crowd booed. He said that the idea of a strong role for government "can't be washed away by dollars and slick TV ads."

With 74 percent of the vote in, Murphy led 54 percent to 44 percent. Murphy's victory, one of several key wins for Democratic Senate candidates throughout the nation, helped the party maintain control of the chamber.

"Chris Murphy went up against a mountain of money and beat an opponent who spent more than anyone else in history to win a seat in the U.S. Senate,'' said Sen. Patty Murray of Washington state, the chairwoman of the Democratic Senatorial Campaign Committee. "We worked hard to support Chris because I knew that he would never back down and always focus on fighting for Connecticut jobs and working families."

The race will go down as the costliest campaign in the state's history. In addition to McMahon's hefty investment, Murphy raised about $10 million, and outside groups flooded the state with an additional $10 million. Much of that money was spent by labor unions, abortion-rights advocates and national Democratic groups who backed Murphy, but McMahon also benefited from ads bankrolled by the U.S. Chamber of Commerce and other conservative groups.

In Stamford, McMahon suggested in comments to supporters that she had no regrets. "We had a good race and I'm really proud of the effort that we had,'' she said. Her husband, Vince McMahon, joined her on stage.

McMahon sought to quell speculation about her future political plans that began even before Tuesday's results were official.

"I do not have any plans to run for office again at this time," she said. "I'm not considering running for governor. That's not an office that I'll be seeking."

The bitter campaign derived much of its intensity because control of the Senate hung in the balance. That drew several big names to the campaign trail, including former President Bill Clinton and former University of Connecticut men's basketball coach Jim Calhoun for Murphy and New Jersey Gov. Chris Christie and Arizona Sen. John McCain for McMahon.

Murphy got his biggest boost from the highest-profile Democratic surrogate: President Barack Obama, who appeared in a television ad endorsing Murphy. It was the only TV ad that the president made for a Senate candidate in the 2012 election cycle and it flooded the state's airwaves on the final weekend of the campaign.

Democrats were jubilant over the victory. Murphy will serve in the Senate alongside Sen. Richard Blumenthal, who defeated McMahon by 12 percentage points in 2010.

"We showed that Senate seats are not for sale," a beaming Blumenthal told the crowd at the Hilton Hartford hotel.

Murphy, 39, is the son of a lawyer and a public school teacher who grew up in Wethersfield and earned a law degree from the University of Connecticut. He made his first run for public office in 1997, winning a seat on the Southington planning and zoning commission, and continued to ascend the political ladder. He was elected to Congress from the state's 5th District in 2006, unseating 12-term incumbent Nancy Johnson.

When Sen. Joe Lieberman announced his retirement in January of 2011, Murphy was immediately tagged as the front-runner to succeed him. He skated past fellow Democrat Susan Bysiewicz in an August primary, and most national pundits predicted that he would have an easy victory against McMahon.

But there were some early stumbles. Murphy, who was largely unknown to vast swaths of the electorate, was painted by McMahon as a legislative lightweight who skipped out on important hearings in Washington.

Murphy was also hurt by revelations that he was sued for foreclosure in 2007, and for failing to pay his rent in 2003. McMahon alleged that he received a special mortgage deal from a local bank that benefited from a bailout that he supported.